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I. Product Overview
This product is an RS-485 bus split hub (HUB) designed specifically to meet the requirements of RS-485 large systems in complex electromagnetic field environments. This product supports a transmission rate of up to 115.2KBPS. In order to ensure the safety and reliability of data communication, the RS-485 interface adopts photoelectric isolation technology to prevent lightning surge from being introduced into the converter and equipment. The built-in photoelectric isolator and 600W surge protection circuit can provide an isolation voltage of 2500V, effectively suppressing lightning and ESD, and effectively preventing lightning strikes and common ground interference. The power supply is powered by an external switch power supply, Safe and reliable, very suitable for outdoor engineering applications. In the RS-485 working mode, the discrimination circuit used can automatically sense the direction of the data flow, and automatically switch the enabling control circuit, easily solving the problem of RS-485 transmission and conversion delay. The RS-485 interface has a transmission distance greater than 1200 meters and stable performance. It is widely used in security monitoring system, Door security, parking lot management system, expressway toll collection system, road monitoring system and power acquisition system. It is a data interface conversion product with excellent performance and good price.
RS-485HUB provides a star shaped RS-485 bus connection. Each port has short-circuit and open circuit protection. Optoelectronic isolation of 2500V allows users to easily improve the RS-485 bus structure, divide network segments, improve communication reliability, and effectively shorten network maintenance time. Reasonable utilization of RS-485HUB can help you design a unique and highly reliable RS-485 system.


II. Performance parameters
1. Interface characteristics: The interface is compatible with EIA/TIA RS-232C and RS-485 standards
2. Electrical interface: The RS-232 interface is a DB9 female connector, the input 485 is a 3-position terminal block, and the output 485 interface is a multi-position terminal block.
3. Transmission medium: twisted pair or shielded twisted pair.
4. Working mode: asynchronous half duplex
5. Working power supply: 9-36V DC/350mA
6. Signal indication: power supply (PWR), transmission (TXD), multi-channel reception indicator light (485-1~485-N)
7. Isolation degree: Isolation voltage 2500VRMS500VDC continuous DC/DC module
8. Transmission rate: 115.2K-300BPS
9. Protection level: RS-232 interface ± 15KVESD protection RS-485 interface with 600W lightning surge protection per line
10. Transmission distance: 0-3 kilometers (115.2K-300BPS)
11. Operating environment: -40 ℃ to 85 ℃, relative humidity of 5% to 95%
12. Equipped with automatic fault isolation function, any problem in one channel does not affect the normal operation of other channels
13. Automatic control technology of data flow direction is adopted to automatically identify and control data transmission direction and automatically adapt to Baud
14. Designed with photoelectric isolation scheme, it has strong anti-interference ability
15. Adopting dedicated DC/DC power isolation module to prevent common ground interference
III. Product List
1. One 1U rack mounted YT-2224U hub (HUB);
2. One AC100-240V to DC12V standard power adapter;
3. 1 DB9 male and female connector wire;
4. One user manual, one warranty card, and one certificate of conformity each.

System parameters
Interface: Compliant with EIA RS-232, RS-485 standards
RS-232 signals: TX, RX, GND
RS-485 signal: T/R+, T/R-
Working mode: Supports asynchronous transmission, point-to-point or multipoint, 2-wire half duplex
Baud: 300 ～ 115.2Kbps, automatic detection of serial port signal rate
Direction control: automatic discrimination and control of data transmission direction
Transmission distance: 5000 meters (9600bps) at RS-485 end, recommended not to exceed 15 meters at RS-232 end
Optoelectronic isolation: isolation voltage 2.5KVrms
Lightning protection: RS-485/422 output provides 1200W of lightning protection per port
Indicator light: Equipped with power and data flow indicators, which can be used to determine the type of fault.
Static electricity protection: 15KV static electricity protection
Work environment
Working temperature: -20 ℃ to 60 ℃
Humidity: Relative humidity 5% to 95%
Working power supply
Input power supply: 9V~30V external DC power supply (standard 220V to DC12V power supply)
Power consumption: Static power consumption within 100mA, average dynamic power consumption within 200mA
Mechanical structure
long × wide × Height: 443mm X45mm X205mm
Shell: Iron shell
Color: Black
Weight: 800g